//- Mixins and associated functions

//- _docsFor: used to identify the language this version of the docs if for;
//- Should be one of: 'ts', 'dart' or 'js'. Set in lang specific _util-fns file.
- var _docsFor = '';

//- Should match `_docsFor`, but in this case provides the full capitalized
//- name of the language.
- var _Lang = 'TypeScript';

//- Simple "macros" used via interpolation in text:
//- e.g., the #{_priv}el variable has an `@Input` #{_decorator}.

//- Use #{_decorator} whereever the word "decorator" is expected, provided it is not
//- preceded by the article "a". (E.g., will be "annotation" for Dart)
- var _decorator = 'decorator';
- var _decoratorCn = '装饰器';

//- Articles (which toggle between 'a' and 'an'). Used for, e.g.,
//- array vs. list; decorator vs. annotation.
- var _a = 'a';
- var _an = 'an';

//- TS arrays vs. Dart lists
- var _Array = 'Array';
- var _array = 'array';

//- Promise vs. Future, etc
- var _Promise = 'Promise';
- var _PromiseUrl = 'https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise';
- var _PromiseLinked = '<a href="' + _PromiseUrl + '">' + _Promise + '</a>';
- var _Observable = 'Observable';

//- Directories & folders
- var _appDir = 'app';
- var _indexHtmlDir = 'project root';
- var _mainDir = _appDir;

//- Location of sample code
- var _liveLink = 'live link';

//- NgModule related
- var _AppModuleVsAppComp = 'AppModule'
- var _appModuleTsVsAppCompTs = 'app/app.module.ts'
- var _appModuleTsVsMainTs = 'app/app.module.ts'
- var _bootstrapModule = 'bootstrapModule'
- var _moduleVsComp = 'module'
- var _moduleVsRootComp = 'module'
- var _platformBrowserDynamicVsBootStrap = 'platformBrowserDynamic'

//- Other
- var _truthy = 'truthy';
- var _falsey = 'falsey';

//- Used to prefix identifiers that are private. In Dart this will be '_'.
- var _priv = '';

//- Use to conditionally include the block that follows +ifDocsFor(...).
//- Generally favor use of Jade named blocks instead. ifDocsFor is convenient
//- for prose that should appear only in one language version.
mixin ifDocsFor(langPattern)
  if _docsFor.toLowerCase().match(langPattern.toLowerCase())
    block

//- Use to map inlined (prose) TS paths into, say, Dart paths via the
//- adjustTsExamplePathForDart transformer function.
mixin adjExPath(path)
  if adjustTsExamplePathForDart
    | #{adjustTsExamplePathForDart(path)}
  else
    | #{path}

mixin includeShared(filePath, region)
  - var newPath = translatePath(filePath, region);
  !=partial(newPath)

mixin makeExample(_filePath, region, _title, stylePatterns)
  - var adjustments = adjustExamplePathAndTitle({filePath:_filePath, title:_title});
  - var filePath = adjustments.filePath;
  - var title = adjustments.title;
  - var language = attributes.language || getExtn(filePath);
  - var frag = getFrag(filePath, region);
  - var defaultFormat = frag.split('\n').length > 2 ? "linenums" : "";
  - var format = attributes.format || defaultFormat;
  - if (attributes.format === '.') format = '';
  - var avoid = !!attributes.avoid;

  if (title)
    if (avoid)
      .example-title.avoid AVOID: #{title}
    else
      .example-title #{title}
  code-example(language="#{language}" format="#{format}")
    != styleString(frag, stylePatterns)

//- Like makeExample, but: (1) doesn't show line numbers. (2) If region
//- is omitted and title is 'foo (r)' then region is taken as 'r'.
//- (3) Title will always end with a phrase in parentheses; if no such
//- ending is given or is just (), then the title will be suffixed with
//- either "(excerpt)", or "(#{_region})" when _region is defined.
mixin makeExcerpt(_filePath, _region, _title, stylePatterns)
  - var matches = _filePath.match(/(.*)\s+\(([^\)]*)\)$/);
  - var parenText;
  - if (matches) { _filePath = matches[1]; parenText = matches[2]; }
  - var adjustments = adjustExamplePathAndTitle({filePath:_filePath, title:_title});
  - var filePath = adjustments.filePath;
  - var title = adjustments.title;
  - var region = _region || (_region === '' ? '' : parenText);
  - var excerpt = parenText || region || 'excerpt';
  - if (title) title = title + ' (' + excerpt + ')';
  +makeExample(filePath, region, title, stylePatterns)(format='.')

//- Get the doc example name either from `_example` if set, or
//- extract the example name from `current`.
- var getExampleName = function() {
-   var dir = current.path[current.path.length - 1];
-   return _example ? _example : dir == 'latest' ? current.source : dir;
- };

mixin makeTabs(filePaths, regions, tabNames, stylePatterns)
  - filePaths = strSplit(filePaths);
  - if (adjustTsExamplePathForDart) filePaths = filePaths.map(adjustTsExamplePathForDart);
  - regions = strSplit(regions, filePaths.length);
  - tabNames = strSplit(tabNames, filePaths.length);
  - if (adjustTsExampleTitleForDart) tabNames = tabNames.map(adjustTsExampleTitleForDart);

  code-tabs
      each filePath,index in filePaths
        - var region = regions[index].trim();
        - var tabName = tabNames[index].trim();
        - var language = attributes.language || getExtn(filePath);
        - var format = attributes.format || "linenums";

        - var frag = getFrag(filePath, region);
        - var sps = Array.isArray(stylePatterns) ? stylePatterns[index] : stylePatterns;
        code-pane(language="#{language}" name="#{tabName}" format="#{format}")
            != styleString(frag, sps)

mixin makeJson( filePath, jsonConfig, title, stylePatterns)
  - var language = attributes.language || getExtn(filePath);
  - var format = attributes.format || "linenums";
  - var frag = getFrag(filePath, '');
  - var json = unescapeHtml(frag);
  - var jsonExtract = extractJson(json, jsonConfig);
  - var avoid = !!attributes.avoid;

  if (title)
    if (avoid)
      .example-title.avoid #{title}
    else
      .example-title #{title}
  code-example(language="#{language}" format="#{format}")
    if (jsonExtract == 'ERROR')
      err 错误: 无法通过配置"#{jsonConfig.toString()}"解析JSON
    else
      != styleString(jsonExtract, stylePatterns)

if !jade2ng
  //- Open (and close) an explanation <div>. See QuickStart
  script.
    function why(id, backTo) {
      var id = "#"+id;
      var el = document.querySelector(id);
      el.hidden=el.hidden=!el.hidden;

      if (el.hidden && backTo){
        // the next line is required to work around a bug in WebKit (Chrome / Safari)
        location.href = "#";
        location.href =  "#" + backTo;
      }
    }
  script.
    function verbose(isVerbose) {
      isVerbose = !! isVerbose;
      var el = document.querySelector('button.verbose.off');
      el.style.display = isVerbose ? 'block' : 'none';
      var el = document.querySelector('button.verbose.on');
      el.style.display = isVerbose ? 'none' : 'block';

      CCSStylesheetRuleStyle('main','.l-verbose-section', 'display',
        isVerbose ? 'block' : 'none');
    }

  script.
    function CCSStylesheetRuleStyle(stylesheet, selectorText, style, value){
      /* returns the value of the element style of the rule in the stylesheet
      *  If no value is given, reads the value
      *  If value is given, the value is changed and returned
      *  If '' (empty string) is given, erases the value.
      *  The browser will apply the default one
      *
      * string stylesheet: part of the .css name to be recognized, e.g. 'default'
      * string selectorText: css selector, e.g. '#myId', '.myClass', 'thead td'
      * string style: camelCase element style, e.g. 'fontSize'
      * string value optional : the new value
      */
      var CCSstyle = undefined, rules, sheet;
      for(var m in document.styleSheets){
        sheet = document.styleSheets[m];
        if(sheet.href && sheet.href.indexOf(stylesheet) != -1){
        rules = sheet[document.all ? 'rules' : 'cssRules'];
        for(var n in rules){
          console.log(rules[n].selectorText);
          if(rules[n].selectorText == selectorText){
            CCSstyle = rules[n].style;
            break;
          }
        }
        break;
        }
      }
      if(value == undefined)
        return CCSstyle[style]
      else
        return CCSstyle[style] = value
    }

//---------------------------------------------------------------------------------------------------------
//- Converts the given project-relative path (like 'app/main.ts')
//- to a doc folder relative path (like 'quickstart/ts/app/main.ts')
//- by prefixing it with '<example-name>/ts/'. If title is not given,
//- then the project-relative path is used, adjusted to remove numeric
//- file version qualifiers; e.g. 'styles.1.css' becomes 'styles.css'.
- var adjExampleProjPathAndTitle = function(ex/*:{filePath,title}*/) {
-   // E.g. of a project relative path is 'app/main.ts'
-   if (ex.title === null || ex.title === undefined) {
-     // Title is not given so take it to be ex.filePath.
-     // Title like styles.1.css or foo_1.dart? Then drop the '.1' or '_1' qualifier:
-     var matches = ex.filePath.match(/^(.*)[\._]\d(\.\w+)$/);
-     ex.title = matches ? matches[1] + matches[2] : ex.filePath;
-   }
-   ex.filePath = getExampleName() + '/' + _docsFor + '/' + ex.filePath;
-   return ex;
- };

//- If the given path is project relative, then first convert it using
//- adjExampleProjPathAndTitle(ex). Then the path is adjusted to match
//- the documentation language.
- var adjustExamplePathAndTitle = function(ex/*:{filePath,title}*/) {
-   // Not a doc folder relative path? Assume that it is app project relative.
-   if(isProjRelDir(ex.filePath)) adjExampleProjPathAndTitle(ex);
-   // Adjust doc folder relative paths if adjustment functions exist.
-   if(adjustTsExamplePathForDart) ex.filePath = adjustTsExamplePathForDart(ex.filePath);
-   if(adjustTsExampleTitleForDart) ex.title = adjustTsExampleTitleForDart(ex.title);
-   return ex;
- };

//- Returns truthy iff path is example project relative.
- var isProjRelDir = function(path) {
-   return !path.match(/\/(js|ts|dart)(-snippets)?\//) && !path.endsWith('e2e-spec.ts');
-   // Last conjunct handles case for shared project e2e test file like
-   // cb-component-communication/e2e-spec.js (is shared between ts & dart)
-   // TODO: generalize: compare start with getExampleName(); which needs to be fixed.
- };

- var translatePath = function(filePath, region) {
-   filePath = filePath.trim();
-   var regionPad = (region && region.length) ? '-' + region.toString() : '';
-   var matches = /{(.*)}.*/.exec(filePath);
-   if (matches) {
-     var topLevelDir = matches[1];
-     var currentPath = current.path;
-     var subPaths = currentPath.slice(2);
-     // subPaths[subPaths.length - 1] = "_." + subPaths[subPaths.length - 1];
-     subPaths[subPaths.length - 1] = "_fragments/" + subPaths[subPaths.length - 1];
-     var newPath = getPathToDocs() + topLevelDir + '/' + subPaths.join("/");
-     var result = newPath + regionPad + ".jade";
-   } else {
-     var extn = getExtn(filePath);
-     var baseFileName = getBaseFileName(filePath);
-     var noExtnFileName = baseFileName.substr(0,baseFileName.length - (extn.length + 1));
-     var folder = getFolder(filePath);
-     // var result = folder + "/_." + noExtnFileName + regionPad + "." + extn;
-     var result = folder + "/_fragments/" + noExtnFileName + regionPad + "." + extn;
-   }
-   return result
- }


- var EMPTY_STRINGS = [ '','','','','','',''];

- var strSplit = function(str, length) {
-   var res;
-   str = str || '';
-   if (!length) {
-     res = str.split(",");
-   } else {
-     res = str.split(",");
-     if (res.length < length) {
-       res = res.concat(EMPTY_STRINGS.slice(0, length - res.length));
-     }
-   }
-   return res;
- }

- var getFrag = function(filePath, region) {
-   var fullFileName = getFragFilePath(filePath, region);
-   var frag = partial(fullFileName);
-   if (frag == null) {
-     return "出错的文件: " + fullFileName + "   所在路径: " + current.path +  " 文档路径: " + getPathToDocs();
-   } else {
-     // ``` gets translated to <pre><code>.....</code></pre> and we need
-     // to remove this from the fragment prefix is 11 long and suffix is 13 long
-     frag = jade2ng ? frag : frag.substring(11, frag.length-13);
-     // Uncomment next line for debugging.
-     // frag = "FileName: " + fullFileName + "   Current path: " + current.path +  " PathToDocs: " + getPathToDocs() + "\n" + frag;
-     return frag;
-   }
- }

- var extractJson = function(json, jsonConfig ) {
-   try {
-     if (jsonConfig) {
-       return extractJsonFragment(json, jsonConfig.rootPath || null, jsonConfig.paths || [], jsonConfig.space || "  ");
-     } else {
-       return json;
-     }
-   } catch (e) {
-     return "ERROR";
-     // return json;
-   }
- }

- var unescapeHtml = function(s) {
-   // can't break across multiple lines because of jade limitations.
-   return s.replace(/&amp;/g, '&').replace(/&lt;/g, '<').replace(/&gt;/g, '>').replace(/&quot;/g, '"').replace(/&#039/g, "'");
- }

- var styleString = function(source, stylePatterns) {
-   if (stylePatterns) {
-      for (var styleName in stylePatterns) {
-        var rxs = stylePatterns[styleName];
-        rxs = Array.isArray(rxs) ? rxs : [rxs];
-        rxs.forEach(function(rx) {
-          source = applyStyle(source, styleName, rx );
-        });
-      }
-   }
-  return source;
- }


- var getFragFilePath = function (filePath, region) {
-   filePath = filePath.trim();
-   var extn = getExtn(filePath);
-   var fileBase = filePath.substr(0,filePath.length - (extn.length + 1));
-   var regionPad = (region && region.length) ? '-' + region.toString() : '';
-   var fullFileName = getPathToFrags() + fileBase + regionPad + "." + extn + '.md';
-   return fullFileName;
- }

//- styles a string according to a regular expression.
//- The match groups resulting from the regexp application are what is styled
//- (not the whole regexp).
- var applyStyle = function(str, styleName, rx) {
-   var repls = {};
-   var matches;
-   do {
-     matches = rx.exec(str);
-     if (matches) {
-       matches.slice(1).forEach(function(match) {
-         var repl = '<span class="' + styleName + '">' + match + '</span>';
-         repls[match] = { repl: repl, isGlobal: rx.global };
-       });
-     }
-   } while (matches != null && rx.global );
-   for (var match in repls) {
-     var repl = repls[match];
-     // var escapedMatch = match.replace(/\\/g,'\\').replace(/\(/g,'\(').replace(/\)/g, '\)').replace(/\./,'\.');
-     // var rx2 = new RegExp(escapedMatch, repl.isGlobal ? "g" : "");
-     var rx2 = match;
-     str = str.replace(rx2, repl.repl);
-   };
-   return str;
- }

- var getExtn = function(fileName) {
-   var ix = fileName.lastIndexOf('.');
-   return ix > 0 ? fileName.substr(ix+1) : "";
- }

- var getBaseFileName = function(fileName) {
-   var ix = fileName.lastIndexOf('/');
-   return ix > 0 ? fileName.substr(ix+1) : "";
- }

- var getFolder = function(fileName) {
-   var ix = fileName.lastIndexOf('/');
-   return ix > 0 ? fileName.substr(0, ix) : "";
- }

- var getPathToDocs = function() {
-   // simple way to only take as many '../' sections as we need to back up to the 'docs' dir
-   // from the current document
-   // we will almost certainly never go 10 or 11 deep but ...
-   return current.pathToDocs || "../../../../../../../../../../../".substr(0, (current.path.length-2)*3);
- }

- var getPathToFrags = function() {
-   return getPathToDocs() + "_fragments/";
- }

- var getPathToExamples = function() {
-   return getPathToDocs() + "_examples/";
- }

//- Extract a subset of a json file in a specified order defined
//- by extractPaths while retaining original order for any
//- unspecified subobjects.
//-
//- based on the principle that JSON.parse(source) constructs objects
//- in order from the top down in 'source' and JSON.stringify(source) iterates 'source'
//- properties according to the order in which they were inserted.  ( the spec actually
//- discourages this assumption but this method will only
//- run on node (v8) and the assumption seems safe there. )
- function extractJsonFragment(source, rootPath, extractPaths, space) {
-   var objSource = JSON.parse(source);
-   if (rootPath && rootPath.length > 0) {
-     objSource = getSubObject(objSource, rootPath);
-   }
-   var objDest = {};
-   extractPaths.trim().split(",").forEach(function(dotPath) {
-     processPath(objSource, objDest, dotPath );
-   });
-   var result = JSON.stringify(objDest, null, space || "  ");
-   return result;

-   function getSubObject(source, path) {
-     var nextSource = source;
-     var pathParts = path.trim().split(".");
-     while (pathParts.length > 0) {
-       var nextProp = pathParts.shift();
-       nextSource = nextSource[nextProp];
-     }
-     return nextSource;
-   }

-   function processPath(source, dest, dotPath) {
-     var nextSource = source;
-     var nextDest = dest;
-     var pathParts = dotPath.trim().split(".");
-     while (pathParts.length > 0) {
-       var nextProp = pathParts.shift();
-       nextSource = nextSource[nextProp];
-       if (pathParts.length > 0) {
-         var val = nextDest[nextProp] || {};
-         nextDest[nextProp] = val;
-         nextDest = val;
-       } else {
-         nextDest[nextProp] = nextSource;
-       }
-     }
-   }
- }
